There are 3 key factors in keeping fish alive: Proper aeration water temperature maintenance and water acidity control. If one of these conditions is out of balance fish become stressed and weakened. Features: Maintains constant water temperature with proper aeration Bubbles B-11 model pump runs up to +/- 40 hours with 2 alkaline D batteries also runs on 1 battery Impact resistant case with rubber booted switch Pumps 1.4 STL/minute Extra thick .75" styrofoam bucket. Will also fit as insert to any 3.5 4.25 or 5 gallon buckets. Special weighted air stones provide greater dissolved oxygen New multi-purpose lid has large opening for easy bait net access cutting surface and mounting tabs for tools and tackle Ideal for crappie and ice fishing Designed for fresh and saltwater use Each unit is individually tank tested to assure highest quality 8 Quart / actual- 7.7 quart 7.2 L Complete and ready to use system